Re: moving more cl seq/mapping support into core

[Richard Stallman]

    > Those are all rather heavy things by nature, so if the calling
    > sequence is heavy too, that's ok.
    > If I added a `remove-if' function I would like it not to be so heavy
    > to use.

    You can use compiler-macros (or an equivalent) to create "fast" calls
    when the keywords involved are known beforehand, as they almost always
    are.

Indeed, one could do that.  However, that doesn't mean that it is
unimportant to choose a good, convenient interface as the one we offer
and document.